Download of EasyRadar 1.0 for Mac was available from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. This free Mac application was originally created by V0LT. The application is included in Productivity Tools.
From the developer:
EasyRadar is a simple tool for calculating the speed of a projectile using nothing more than an audio recording and a known distance. By entering the air temperature, the distance, and the delay between the sound of the projectile firing, and hitting its target, EasyRadar can calculate the average speed of the projectile with great accuracy.
You may want to check out more software for Mac, such as RubyCalc, PinholeCalc or NetCalc, which might be related to EasyRadar.